煤层开采后地表下沉盆地变形分析

Analysis on Land Subsidence Basin Deformation after Mining

同煤集团永定庄煤矿的14层和15层煤是上下层位关系,两层煤对应的地表为村庄建筑物,煤层开采后对地表产生一定影响。为了解两层煤采后地表盆地运动情况,设计了产生地表变形最大的预计方案,采用概率积分法对开采后的地表变形进行预计。预计结果显示最大地表下沉值为950 mm,下沉盆地没有达到充分采动,地表下沉盆地的影响范围是采空区范围的8.9倍,由于采深较大,开采面积较小,地表变形属于正常波动范围,不影响煤矿安全开采。

No. 14 and No. 15 coal seam is high and low seam in Yongdingzhuang Mine of Datong Mining Group, the corresponding surface of the two coal seam is village buildings, which affected the surface after mining. In order to know the movement of surface basin of the two seam after mining, the maximum deformation of the plan was designed, the surface movement was predicted by probability integral method. The prediction result showed that the maximum surface sinking is950 mm, sinking basin without the sufficient mining, the range influence of surface sinking basin is 8.9 times than the goaf,due to the large mining depth, with small mining area, the surface deformation belongs to the normal range, which did not affect the safe mining.